Internal-combustion engine



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' o. KRoGH INTERNAL CMBUSTION ENGINE Filed Nov. 12, i925 C. KROGHINTERNAL COMBUSTION ENGINE Sept. 14 1926.

3mm/1. boi@ OO rOLg/z 1925v 3 Sheets-Sheet 5 Filed Nov. 12

Patented Sept. 14, 1926i ofrfr'o Kaden, on nn'rnorr, vr/rrcnreraul/` iINTERNAL-COMBUSTION ENGINE.

Application filed Nvember 12,' 1925;rv

rIhis invention relates to internal combustion engines ofthe doubleacting type although the principleinvolved may be also employed inConnection with other types of internal combustion engines. 1

An object of the invention resides inthe provision of separatecompression cylinders whichy may be positioned laterally Vwith `respectto the explosion cylinders, and in which the cylinder charges arecompressed and then directed to the explosion chamber.

'Another object of the invention consists in so-arranging both the'explosion cylinder and the compression cylinder that thererspe'ctivepistons thereof may both be `attached to the same piston pin'whichin'zturn has two connections with the main lcrank shaft.

A further object ofy l in a construction in which a much lighterflywheel may be employed and in which the flywheel may be positionedmidway o the length ofthe crank shaft ratherthan at an extreme endthereof. i

Another object of the invention is to `so construct and combine theparts that the engine is one of extreme simplicity compris ing few partsand susceptible'of `production `at a. relatively low cost. i

'Other' obj ects and advantages of theinvention will be apparent fromthe following description when taken in connection'with the accompanyingdrawings in which l Figure 1 is a vertical longitudinal section throughone embodiment ofthe invention employing twoy explosion cylinders.

Figure 2 isv arear elevational view of the engine shown in Figure 1. v

Figure 3 is an end elevational ing the carburetor and connections inview showfull , lines.

Figure 4 is a fragmentary sectional view of one end of one of thecompression cylinders.

Figure 5 is an elevational view taken at the side opposite to that shownin Figure 2.

Figure 6 is a vertical sectional view taken on the line 6-6 of Figure 5,and

Figure 7 is al fragmentary horizontal section through the upper portionof the casino'.

z'eferring to the drawings more in detail the numeral 1 designatesgenerally the crank case in which is mounted the crank shaft 2 providedwith the number of crank'arms 3 desired, and while four such arms areshown the invention resides f -13 withthe inlets lends of the cylindersthe inner limit of the.

serial No. esiste.-y

in the ypresent embodiment ofthe inventionv itwill be apparent thatthisnumber may be i increased or decreased depending upon the v numberof lexplosion cylinders required.

Mounted above the crank `case are two double' acting explosion cylinders4 each provided withi the' usual' water jackets y 5. rFliese cylinders 4are plosion chamberl 6 aty eachv end thereof provided with-a sparkingdevice`7 (Figp):

`Flach. Vcylinder 4*isalso Aprovided with a' `doublepiston 8 which isclosed at Vits :outer ends'fand with ycharge receiving inlets 9 to belaterdescribed. 1'- 'i Positioned adjacent each explosion cylinder 4 butspaced therefrom is a compression cylinder .10 vin which is mounted adouble piston 11 having its .outer ends open as shown in Figures 1 and4. .The Vextreme ends of the-cylinders 10 are providedwith outlets12fwhich l v9 of thel explosion chambers, and itshould here be vnotedthat these inlets are located at ypoints remote from the 4; i. e., atsubstantially stroke of the piston 8. y On rtheside of each compressioncylinder 10 opposite to the outlet 12 is anintake valve 14 positioned inthe intake manifold 15 to which may be attached'l any type' `ofcarburetor 16.`

I will now describe the structure by which the pistons 8 and 11 areoperated. 1

A ypiston pin 17. extends through the pis- 10 and has connected` theretoaconnecting formed with an ex.

are connected by conduits' rod V18V as clearly` depicted `on 'Figure 1.

Thiszconnecting rod yis located between the two cylinders and has itslopposite end attached to the crank arm 3. Piston pin 17 is alsoprovided with an extension 19 to which is attafbwl a connecting/rod 20having its opposed nw-1! associated with a crank arm 3.k Obviously aclearance must be provided forv the reciprocation i and for this purposeare provided with slots 21 and 22 respectively, these slots being closedby the side walls of the elongated pistons 8 and 11.

Exhaust ports the walls of the cylinders 4` at points `opposite theintake ports `9, and these ports communicate with exhaust pipes 24leading to the atmosphere. y Circulation of a cooling the cylinders 4and 10 the vertically extending 23 (Fig. 2) are formed ,inl

100. i' of the piston vpin 17 'l Cil the pipes 25 Whichqcommunicate Withthe Water jacket 5, and which may be connected to the radiator by theusual hose couplings (not shown).

In the preferred form of the invention the flywheel 26 is mountedintermediate the ends ot' the crank shaft 2 and is geared to the lightdynamo 27 (Fig. 3)A and the starting motor v28. 'Ivhe entire engine ifpre'- ferrred may be enclosed Within a casing E29.

From the foregoing description taken in connection with the accompanyingdrawings it -will be apparent that I have devised a simple and novelconstruction by which the charges for internal combustion engines of anytype may be compressed independently of' the explosion cylinders, 'thatthe engine will generate considerable pov/ver even at low speeds, andwill be almost vibrationless in operation;

In accordance with the patent statutes I have described what I nowbelieve tokbe the best embodiment of the invention, but I do `not Wishto be understood thereby as limiting myself or the scope of theinvention, as many changes and modilications may be made Withoutdeparting from the spirit of the invention; all such I. aim to includein the scope et the appended claims.

TW hat I claim as new and desire to secure by Letters Patent is: i

l. In combination an explosion cylinder and a compression cylinderarranged adjacentvthereto and parallel therewith, pistons arranged ineach of said cylinders, a crank shat't, connecting rods betiven saidcrank shaft and pistons, and conduits leading from the extreme ends ofthe compression cylinder to the opposed ends of the eX'- plosioncylinder.

2. In combination an explosion cylinder and a compression cylinderadjacent thereto and parallel therewith, pistons arranged in each ofsaid cylinders, means ,for operating said pistons in unison, conduitsleading from the extreme ends of the compression cylinder to the opposedends ot the explosion cylinder, and an intake valve for each end ofthecompression cylinder.

3. In a double acting explosive engine a cylinder having an explosionchamber at each end thereof, a double piston in. said cylinder, acompression cylinder adjacent said first-named cylinder, a double pistonin said compression cylinder,v` means for operating said pistons inunison, and conduits leading from the outer 'extreme ends ot' thecompression cylinder to the inner ends of the explosion chambers.

4. In a rdouble'acting explosive engine a cylinder having an explosionchamber at each end thereof, a double piston in vsaid cylinder havingits outer ends closed, ay cylinder adjacent said first` compressionnamed cylinder, a-double piston in said cornpression cylinder having`its outer ends open, means for operating said pist-ons in unison, andconduits leading from the outer eXtreme ends ot the compression cylinderto the inner ends of the explosion chambers.

`5. In a double acting explosive engine a cylinder having an explosivechamber at each end thereof, a compression cylinder spaced slightly fromsaid first-named cylind-er, doublev pistons in each of said cylinders, apiston pin extending through both cf said double pistons, a crank"shaft, anda connecting rod positioned between said cylinders andconnected to said piston pin and crank shaft,

G. In combination an explosion cylinder and a compression cylinderspaced apart, a piston in each of said cylinders, a piston pin extendingthrough both of said pistons and provided With an extension, a crankshaft, connecting rods attached to said crank shaft, one of saidconnecting rods being positioned between said cylinders and connected toan intermediate portion ot said piston pin, the other connecting rodbeing connected to the extension of said piston pin.

- OTTO KROGII.

